Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 4 - Congruent Triangles - 4-1 Congruent Figures - Practice and Problem-Solving Exercises - Page 223: 36


$E=21$ degrees

Work Step by Step

If two triangles are congruent, the corresponding angles and sides are congruent as well. Thus, we find: 3y=6y-21 y=7 Plugging back into the original equation: $E=3(7)=21$
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